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2018 Mazda6 2.5T First Drive Review | Smooth operator

ANN ARBOR, Mich. — We like driving Mazdas, even if it's not the Miata, because they've always got an underpinning spirit of enthusiasm that makes even the slowest Mazda3 or the heaviest CX-9 at least somewhat entertaining. So when Mazda announced the refresh of the Mazda6 for the 2018 model year, we perked up. A new engine and some other refinements are exciting, sure, but maybe more important is the redesigned interior. Mazda's interiors haven't always impressed, but over the years they've improved — and this generation of the Mazda6 up until now has been an example of that improvement. Fortunately, because they're fun to drive, we've been able to overlook some interior foibles. Much attention was paid to noise, vibration and harshness (NVH). The company says it made 70 changes, from tires to suspension geometry to sound deadening materials, in order to make the car more comfortable going down the road, while maintaining its fun driving dynamics, and none of them include active noise cancellation. Of course, the turbocharged version of the 2.5-liter Skyactiv-G engine should help with the fun. We got behind the wheel of the 2018 Mazda6 2.5T, in top-tier Signature trim, to drive it on some of our favorite Michigan roads. We were especially interested in figuring out whether the interior lived up to the hype, and whether the other refinements would dull the car's driving dynamics. Mazda seems like it's laying the groundwork to pushing its brand upmarket. With exterior design nailed down — the Mazda6 is a handsome sedan, and receives minor tweaks for 2018 to make it more so. In fact, this car is laden with the automotive equivalent of sex appeal (which some would just call sex appeal). It's absolutely magnetic. If you're not feeling it, check it out from a different angle; it'll change your mind. As we mentioned, the company has turned its attention to the experience inside the car, and in addition to new materials inside, it has a new top-tier Signature trim level, which Mazda refers to as "aspirational" — but at $35,640, it's not exactly out of reach. It's rare that we get into any sub-$40k car and start caressing the interior with both eyes and fingertips. It happens rarely – the last one was the Honda Clarity PHEV, which was a real surprise. The 2018 Mazda6 marks the second occasion. Both times we were taken completely off guard by it. The Mazda, though, has the exterior charm to match. The new seats are fantastic, too.

How Mazda got Skyactiv-X to work is incredible

"Take everything you know about engines and turn it around," Mazda North America Vehicle Development Engineer Dave Coleman says, patiently and with a look of benevolent pity, as he's quizzed about the particulars of the company's new engine. The Skyactiv-X engine is enigmatic — and deceptively simple in operation. And the bottom line for American consumers is that they'll be able to buy a car (or crossover; we don't know yet what vehicle will first get it) by late 2019 that provides diesel-like fuel economy but runs on regular old gasoline. In between diesel and spark ignition, but it's neither To truly understand it, you have to dive into the contradictions. Take that regular old gasoline: Contrary to common sense, the lower the octane, the better it works. In the lab, the Skyactiv-X engine loves 80 octane. The lowest Americans get is 87, so the engine is tuned for that octane. Go higher and you lose some low-end torque. Coleman was right. It's hard to wrap your head around an engine that thrives just at the point when most gas engines would aggressively self-destruct. It uses a supercharger to pump additional air — but not additional fuel. It uses spark plugs to start a combustion cycle that normally doesn't need a spark. And, quixotically, it's not displacing Mazda's own American-market diesel engine, currently languishing in a seemingly endless hell of regulatory approval. More bizarre: Mazda is a tiny automaker facing real existential headwinds, and gasoline compression ignition is a massive challenge. GM and Hyundai announced compression ignition, or HCCI, projects (full name, homogeneous charge compression ignition) to great fanfare, but they never amounted to a production hill of beans, crippled by reliability issues or horrible vibrations. Worse, they only worked at an unusably narrow range — low RPMs and low loads. HCCI research improved direct-injection gas and diesel engine technologies for these companies, but HCCI itself remains untamed. The benefits of lean combustion Why even try to tame HCCI? The answer is much better fuel economy and lower emissions. Less burned carbon-based fuel, less carbon dioxide released. That's simple. But there are some thermodynamic reasons for the lean combustion you can achieve with compression ignition that are worth explaining. The ideal amount of fuel for a conventional engine to burn is about a 14:1 air-to-fuel ratio. That lets every molecule burn nicely, in theory.

China's FAW now building all three Mazda6 generations

The Chinese auto market is one of the most interesting in the world to look at. Its automakers appear to still be figuring things out and remain open to experimentation. For example, at this moment, you can buy new copies of all three generations of the Mazda6 from showrooms there.
Mazda joint-venture partner FAW recently introduced the latest generation to China as the Mazda6 Atenza, according to Just Auto. Yet buyers still have the option of getting the previous generation as well, which is sold as the Mazda6 Ruiyi. Obviously, that isn't too remarkable - companies in the US have briefly sold two generations of the same nameplate simultaneously for brief points in the past, and the practice is much more common in developing markets. However, Chinese consumers still have the third choice, too - the first-generation model that dates back to the early 2000s, is still on offer, known simply as Mazda6.
While it would be hard to imagine selling three generations of the same models at once in the US, the idea is an interesting one. We enjoyed our long-term test of the latest generation, and the previous models weren't bad cars either, so provided there's a healthy difference in pricing and marketplace confusion is limited by differing names, we can see it working. If nothing else, it's a fascinating illustration of how broad China's developing auto market really is.